1/y=y/9

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Solution for 1/y=y/9 equation: 


D( y )

y = 0

y = 0

y = 0

y in (-oo:0) U (0:+oo)

1/y = y/9 // - y/9

1/y-(y/9) = 0

1*y^-1-1/9*y^1 = 0

(1*y^0-1/9*y^2)/(y^1) = 0 // * y^2

y^1*(1*y^0-1/9*y^2) = 0

y^1

(-1/9)*y^2+1 = 0

(-1/9)*y^2+1 = 0

DELTA = 0^2-(1*4*(-1/9))

DELTA = 4/9

DELTA > 0

y = ((4/9)^(1/2)+0)/(2*(-1/9)) or y = (0-(4/9)^(1/2))/(2*(-1/9))

y = -3 or y = 3

y in { -3, 3} 

y in { -3, 3 }

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